Padlock



Patented Sept. 3, 1929.

i r eTitlhlT GFFECE.

FRITZ SCHGBI, F WETZIKOBT, S'WITZEELAITD, ASSIGNOR, TO THE FIRM BAUER A. G., OF ZURICH, SVJITZERLAND.

PADLOCK.

Application filed Gctober 22, 1927.

The object of the present invention is to overcome the disadvantage inherent to padlocks of the known type that their casing shows points formed by rivet heads or other projecting parts which are liable to be attached when the padlock is forcibly opened by means of tools.

This purpose is obtained with the padlock according to the present invention in that the casing which receives the shackle is closed by a cover pressed into the casing, the cover being housed in a part of the casing which is machined out of a solid piece of material.

Thus the padlock affords an increased security against being opened.

A constructional example of the subj ect matter of the present invention is illustrated on the accompanying drawings, in which Fig. 1 is an elevation view of the padlock with the cover removed,

ig. 2 is a vertical section,

Figs. 3 and a show horizontal sections along the lines III-III and IVIV respectively in Fig. 1,

Fig. 5 shows the tumblers in their inoperative position.

The casing of the padlock consists only of the two parts 1 and 2 of which the first is worked out of a solid piece of material, whilst 2 designates the cover pressed into the part 1 and forming the rear wall of the casing. To the circular joint 3 on the rear side of the casing corresponds a circular groove t on the front side and for misleading unauthorized persons attempting to open the lock; the cover 2 is flush with the rear facing of the part 1. Inside the casing a key-guide 6 serving'to guide the flat key 5 is arranged and recessed in the front wall as well as in the rear wall of the casing. The key-guide 6 is provided with a portion of a reduced diameter having two flat facings 6 arranged opposite each other. On this reduced portion of the key-guide 6 a disk 7 is mounted carrying two pins 8 arranged diametrically opposite each other and projecting with their free ends into bores provided in the front part of the keyguide 6; thus the disk 7 takes part in the turning of the key-guide 6. On the two pins 8 two similar groups of tumblers are mounted and the tumblers of one group are designated by 9 and those of the other Serial No. 227,99G.

group by 10. The tumblers 9 and 10 are provided with projections 9 and 10 and the projections 9 are opposed to the projcctions 10. The projections 9 and 10 cooperate with their oblique facings with oblique facings 11 and 12 respectively formed by recesses in the casing part 1. The tumblers 9 and 10 are influenced by springs 18 and 1% respectively fixed with their one ends to the tumblers and bearing with their free ends against the casing part 1; in their position of rest illustrated in Fig. 1 the-lower projections of the tumblers coooperate with the facings 11 and 12 respectively whereby the key guide 6 for the key and the lock are locked.

The disk 7 arranged on the key-guide 6 is provided with a cam 7 adapted to co operate with a two armed locking lever 15 mounted on a pivot pin 16 which is proinserted in a recess of vided on a pin 1( the casing part 1. A compression spring 18 tends to maintain the locking lever 15 in ts operative positlon 1n whlch its two arms enter recesses provided in the shackle 19 and secure the latter in the closed position. The shackle 19 has two shanks of unequal length, of which the longer one serves as guide part to which end a pin 20 inserted in the casing part 1 cooperates V ith a slot 21 of the shackle 19. In a bore of the guide shank of the shackle 19 a compression spring 22 is lodged which bears with its other end on the bottom of a bore provided in the casing for the reception of the guide shank of the shackle.

On introducing the proper fiat key 5 into the key-guide (to the required depth) the tumblers 9 and 10 are angularly displaced about the pins 8 so that their lower projecting noses 9, 10' move out of engage ment with the correspondingoblique facings 11 and 12 whereby the key-guide 6 guiding the key is unlocked. By a subsequent turning of the key 5 the locking lever 15 is turned against the action of the compression spring 18 by means of the cam 7' of the disk 7 and moved out of engagement with the shackle 19. The latter is thereupon thrust out of the casing 1, 2 by the action of the compression spring 22 to such an extent that its shorter shank is at a distance from the casing, whereby the padlocx may be removed from the object to which it has been applied; to that end the shackle 19 pushed out of the casing may be turned about its longer shank serving as aXis of rotation as the guide slot 21 ends in a portion 21 (Fig. 1) arranged at right angles to the slot 21 to permit the turning of the shackle.

The shackle 19 may again be brought into the closing position and locked when the locking lever 15 has been brought into the locking position by turning the cam 7 and key-guide 6 respectively in the opposite direction to which it has been turned for opening the look.

If a key is inserted into the guide 6 which causes an excessive turning of the tumblers 9 and 10 their upper projections 9 and 10 respectively cooperate with the upper facings 11' and 12 respectively and are pressed against the latter when the key is turned so that an unlocking of the lock is prevented. The oblique facings on the tumblers cause, when an increased power is exerted by turning the wrong key, these facings to more and more deviate in the outward direction and the locking is increased thereby.

The casing of the above described padlock has no projecting parts, whereby a forcible opening of the lock is rendered more diificult.

I claim:

1. A padlock, comprising a casing provided with facings, a key-guide rotatably mounted in said casing and adapted to re ceive a flat key, two pins connected to said key-guide, two groups of tumblers turnably mounted on said pins and provided with projections cooperating with said facings of the casing, a shackle operatively connected to said casing, means for locking the shackle and means on the guide for operating the locking means.

2. A padlock, comprising a casing provided with facings, a key-guide rotatably mounted in recesses in the front wall and in the rear wall of said casing and adapted to receive a flat key, two pins connected to said guide, two groups of tumblers turnably mounted on said pins and provided with projections cooperating with said facings of the casing, a shackle operatively connected to said casing, means for locking the shackle and means on the guide for operating the locking means.

3. A padlock, comprising a casing provided with facings, a key-guide rotatably mounted in recesses in the front wall and in the rear wall of said casingand adapted to receive a fiat key, two pins connected to said guide, two groups of tumblers turnably mounted on said pins and provided with projections cooperating with said facings of the casing, a shackle operatively connected to said casing, means to lock the shackle and a camfloperatively connected to said keyguide and adapted to operate said locking means to unlock said shackle.

4. A padlock, comprising a casing provided with facings, a key-guide rotatably mounted in recesses in the front wall and in the rear wall of said casing and adapted to receive a flat key, two pins connected to said guide, two groups of tumblers turnably mounted on said pins and provided with projections cooperating with said facings of the casing. a shackle operatively connected to said casing, a lever for locking the shackle and a cam operatively connected to said keyguide and cooperating with said lever for locking said shackle in the closed position of the lock.

5. A padlock comprising a casing, a rotatable key guide therein, flat tumblers mounted on the key-guide, a cam on the key-guide, a shackle having a notch in each shank, a spring-urged locking lever pivoted in the casing between the shanks of the shackle and in the path of said cam and normally engaging said notches.

6. A padlock comprising a casing, a shackle each le of which has a notch, a spring-urged lever pivoted in the casing and engaging both notches, a key-guide rotatably mounted in the casing whose longitudinal axis lies across the axis of said lever, tumblers pivoted between their ends on said guide, one end of said tumblers normally engaging facings on the casings, and the otherends arranged to engage similar facings when an oversized key is used, and a cannon the guide arranged to laterally engage and swing said lever out of the notches.

In testimony whereof I have signed my name to this specification.

FRITZ SCHORI. 

